You are the administrator of an Active Directory domain. All servers run Windows Server 2003. All client computers run Windows XP Professional and are members of the domain.  The domain contains a single DNS server named Server1. Root hints are enabled on Server1. Internet access for the company is provided by a Network Address Translation （NAT） server named Server2. Server2 is connected to the Internet by means of a permanent connection to the company’s ISP.  Users report that they can no longer connect to http：//www.adatum.com. Users can connect to internal resources and to other Internet Web sites. You can successfully access http：//www.adatum.com from a computer outside of the corporate network.You need to ensure that the users can access http：//www.adatum.com. You must also ensure that users retain their ability to access internal resources.   Which two actions should you perform？（）

• A、Disable Routing and Remote Access on Server2.
• B、Create a root zone on Server1.
• C、On all affected users’ computers， run the ipconfig /flushdns command.
• D、Configure all affected users’ computers to use the ISP’s DNS server.
• E、Use the DNS console on Server1 to clear the DNS cache.